What number[?]would make this statement true? (4x+?)(x+5)=4x^2+?x+20x+40

Please someone help

Simonne used the following steps to simplify the given expression. 12 - 3(-2x + 4) step 1: 12 + (–3)·(–2x) + (–3)·(4) step 2: 12 + 6x + (–12) step 3: 12 + (–12) + 6x step 4: 0 + 6x step 5: 6x what property of real numbers was used to transition from step 3 to step 4? a. identity property of addition b. inverse property of addition c. associative property of addition d. commutative property of addition

The total number of dental clinics total for the last 12 months was recorded

If np3 /nc2 = 6, find the value of n